Bump the all group in /dependabot with 3 updates

Bumps the all group in /dependabot with 3 updates: [zope-formlib](https://github.com/zopefoundation/zope.formlib), [zope-interface](https://github.com/zopefoundation/zope.interface) and [multipart](https://github.com/defnull/multipart).


Updates `zope-formlib` from 6.0 to 6.1
- [Changelog](https://github.com/zopefoundation/zope.formlib/blob/master/CHANGES.rst)
- [Commits](zopefoundation/zope.formlib@6.0...6.1)

Updates `zope-interface` from 7.1.1 to 7.2
- [Changelog](https://github.com/zopefoundation/zope.interface/blob/master/CHANGES.rst)
- [Commits](zopefoundation/zope.interface@7.1.1...7.2)

Updates `multipart` from 1.1.0 to 1.2.1
- [Release notes](https://github.com/defnull/multipart/releases)
- [Changelog](https://github.com/defnull/multipart/blob/master/CHANGELOG.rst)
- [Commits](defnull/multipart@v1.1.0...v1.2.1)

---
updated-dependencies:
- dependency-name: zope-formlib
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: all
- dependency-name: zope-interface
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: all
- dependency-name: multipart
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: all
...

Signed-off-by: dependabot[bot] <support@github.com>

dependabot/requirements.txt

@@ -24,12 +24,12 @@ zope.error==5.0
 zope.event==5.0
 zope.exceptions==5.2
 zope.filerepresentation==6.0
-zope.formlib==6.0
+zope.formlib==6.1
 zope.hookable==7.0
 zope.i18n==5.2
 zope.i18nmessageid==7.0
 zope.index==7.0
-zope.interface==7.1.1
+zope.interface==7.2
 zope.intid==5.0
 zope.keyreference==6.0
 zope.lifecycleevent==5.0
@@ -68,7 +68,7 @@ ZConfig==4.1
 ZODB==6.0
 bcrypt==4.2.1
 cffi==1.17.1
-multipart==1.1.0
+multipart==1.2.1
 persistent==6.1
 pycparser==2.22
 python-gettext==5.0